You would use them when you may go shopping for example you would do
i need -1 butter and -5 bread
you might need to translate this on google
The mean of sample means is the same as the mean of the underlying distribution.
The standard deviation of sample means is the original distribution sample mean divided by the square root of the number of samples.
Mean of sample mean distribution: 64
SD of sample mean distribution: 4/√64 = 1/2
By Sine Rule,
x/sin30° = 8/sin90°
x/0.5 = 8/1
So x = 4.
